6921740810 has 16 divisors (see below), whose sum is σ = 12472447176. Its totient is φ = 2765737728.

The previous prime is 6921740803. The next prime is 6921740887. The reversal of 6921740810 is 180471296.

It is a Cunningham number, because it is equal to 83197²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 4077971881 + 2843768929 = 63859^2 + 53327^2 .

It is a super-2 number, since 2×6921740810² = 95820991681638912200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359987 + ... + 378726.

Almost surely, 2^6921740810 is an apocalyptic number.

6921740810 is a deficient number, since it is larger than the sum of its proper divisors (5550706366).

6921740810 is a wasteful number, since it uses less digits than its factorization.

6921740810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739657.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 6921740810 is about 83197.0000060098. Note that the first 5 decimals coincide. The cubic root of 6921740810 is about 1905.7756671144.

The spelling of 6921740810 in words is "six billion, nine hundred twenty-one million, seven hundred forty thousand, eight hundred ten".